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Celecoxib
From Wikipedia, the free encyclopedia.
(Redirected from Celebrex)
celecoxib structure
Celecoxib
4-(5-(4-Methylphenyl)-
3-(trifluoromethyl)-1H-pyrazol-1-yl)
benzenesulfonamide
Empirical formula C17H14F3O2S
Molecular weight 381.373
Bioavailability (Oral) ?
Metabolism hepatic (mainly CYP2C9)
Elimination half-life 11 hr
Excretion 27% total urinary excretion including metabolites
Pregnancy category B3 (Aust)
Legal status prescription only (U.S.)
Schedule 4 (Aust)
POM (UK)
Routes of administration oral
Celecoxib is a non-steroidal anti-inflammatory drug (NSAID) used in the treatment of osteoarthritis, rheumatoid arthritis, acute pain, painful menstruation and menstrual symptoms, and to reduce numbers of colon and rectum growths polyps in patients with familial adenomatous polyposis. It is marketed by Pfizer under the brand name Celebrex.
Contents
1 Pharmacology
2 Adverse effects
2.1 Gastrointestinal ADRs
2.2 Cardiovascular risk
2.3 Allergy
3 Commercial history
4 References
5 External links
Pharmacology
Celecoxib is a highly selective COX-2 inhibitor and primarily inhibits this isoform of cyclooxygenase, whereas traditional NSAIDs inhibit both COX-1 and COX-2. Celecoxib is approximately 10-20 times more selective for COX-2 inhibition over COX-1. In theory, this specificity allows celecoxib and other COX-2 inhibitors to reduce inflammation (and pain) while minimizing gastrointestinal adverse drug reactions (e.g. stomach ulcers) that are common with non-selective NSAIDs. It also means that it has a reduced effect on platelet aggregation compared to traditional NSAIDs.
Adverse effects
Main article: Non-steroidal anti-inflammatory drug
Aside from the incidence of gastric ulceration, celecoxib exhibits a similar adverse drug reaction (ADR) profile to other NSAIDs.
Gastrointestinal ADRs
In theory the COX-2 selectivity should result in a significantly lower incidence of gastrointestinal ulceration than traditional NSAIDs. The main body of evidence touted to support this theory were the preliminary (6 month) results of the Celecoxib Long-term Arthritis Safety Study (CLASS) as published in 2000, which demonstrated a significant reduction in the incidence of gastrointestinal ulceration in those taking celecoxib versus ibuprofen or diclofenac. (Silverstein et al, 2000) The final (12 month) results from the CLASS study, however, did not indicate any advantage of celecoxib over the other NSAIDs in the study. (Malhotra, Shafiq & Pandhi, 2004)
Cardiovascular risk
The withdrawal of rofecoxib from the market in 2004 due to an increased risk of adverse cardiovascular events led to the suspicion that this was a class effect. Indeed an increased risk of heart attack and stroke was found in a National Cancer Institute study studying the use of 400-800 mg celecoxib daily for the prevention of colorectal adenoma (relative risk 2.3-3.4 vs placebo). (Solomon et al., 2005)
There is still much conjecture, however, as to whether this risk is significant for the majority of patients being treated with lower doses for osteoarthritis.
Allergy
Celecoxib contains a sulfonamide moiety and may cause allergic reactions in those allergic to other sulfonamide-containing drugs. This is in addition to the contraindication in patients with severe allergies to other NSAIDs.
Commercial history
Celecoxib was developed by G. D. Searle & Company and marketed jointly by Searle and Pfizer under the brand name Celebrex. Searle was acquired by Pharmacia, which was then acquired by Pfizer, in part so that Pfizer could take full control of Celebrex.
Celecoxib is available by prescription in capsule form.
References
* Malhotra S, Shafiq N, Pandhi P (2004). COX-2 inhibitors: a CLASS act or Just VIGORously promoted. MedGenMed 6 (1), 6. PMID 15208519
* Silverstein FE, Faich G, Goldstein JL, Simon LS, Pincus T, Whelton A, et al (2000). Gastrointestinal toxicity with celecoxib vs nonsteroidal anti-inflammatory drugs for osteoarthritis and rheumatoid arthritis. The CLASS study: a randomized controlled trial. JAMA 284 (10), 1247-55. PMID 10979111
* Solomon SD, McMurray JJ, Pfeffer MA, Wittes J, Fowler R, Finn P, et al (2005). Cardiovascular risk associated with celecoxib in a clinical trial for colorectal adenoma prevention. N Engl J Med 352 (11), 1071-80. PMID 15713944
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